摘要 : The ruthenium vinylidenes [RuCl_2](=C=CHR)(PR'_3)_2](1,2)react with 1,2-C_2H_4(PCy_2)_2(3) to give the chelate complexes [RuCl_2=C=CHR)(k~2-3)](4,5) by displacement of the two monodentate phosphane ligands.In contrast,the reaction... 展开 The ruthenium vinylidenes [RuCl_2](=C=CHR)(PR'_3)_2](1,2)react with 1,2-C_2H_4(PCy_2)_2(3) to give the chelate complexes [RuCl_2=C=CHR)(k~2-3)](4,5) by displacement of the two monodentate phosphane ligands.In contrast,the reaction of the hydrido compound [RuHCl(=C=CH_2)(PCy_3)_2](6) with excess 3 proceeds by migrationof the hydride to the Ca carbon atom of the vinylidene unit and affords the six-coordinate vinyl complex trans-[RuCl(CH=CH_2)(k~2-3)_2](7).Protonation of 7,followed by addition of NH_4PF_6,yields the cationic ruthenium carbene trans-[RuCl(=CHCH_3)(k~2-3)_2]PF_6 (8),together with small quantities of the hydrido compound [RuH(k~2-3)_2]PF_6 (9).The Grubbs catalyst [RuCl_2=(CH-h)(PCy_3)_2] (11),also by ligand substitution,togive the corresponding chelate compelxes [RuCl_2(=CHPh)(k~2-3)] (12) and [RuCl_2(=CHPh)(k~2-11)](13);the latter has been characterized by X-ray crystalstructure analysis. 收起